From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [PATCH 1/2] export cpu_tlbstate to modules Date: Mon, 10 Aug 2009 14:56:46 -0700 Message-ID: <4A80979E.3080204@zytor.com> References: <20090810185302.GB13924@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@elte.hu To: "Michael S. Tsirkin" Return-path: Received: from terminus.zytor.com ([198.137.202.10]:36764 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753627AbZHJV5I (ORCPT ); Mon, 10 Aug 2009 17:57:08 -0400 In-Reply-To: <20090810185302.GB13924@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: On 08/10/2009 11:53 AM, Michael S. Tsirkin wrote: > vhost net module wants to do copy to/from user from a kernel thread, > which needs switch_mm (like what fs/aio has). > export cpu_tlbstate to make this possible > > Signed-off-by: Michael S. Tsirkin > --- > arch/x86/mm/tlb.c | 1 + > 1 files changed, 1 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c > index 821e970..e33a5f0 100644 > --- a/arch/x86/mm/tlb.c > +++ b/arch/x86/mm/tlb.c > @@ -13,6 +13,7 @@ > > DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) > = { &init_mm, 0, }; > +EXPORT_PER_CPU_SYMBOL_GPL(cpu_tlbstate); > > /* > * Smarter SMP flushing macros. Wouldn't it be a *lot* better to move use_mm() from fs/aio.c into common code, and export that instead? -hpa